Watchcase-spring



(No Model.) I

G. NOBS, Jr. WATGHGASE SPRING.

No. 569,297. Patented Oct. 13-, 1896.

WITNESSES: INVENTORI 7 26W (CHAR ES NE JR UNITED STATES PATENT OFFICE.

CHARLES NOBS, JR, OF NEVARK, NE\V JERSEY,

WATCHCASE-SPRING.

SPECIFICATION forming part of Letters Patent No. 569,297, dated October13, 1896.

Application filed May 28, 1896.

To all whom it may concern:

lle it known that I, CHARLES NOBS, J r.-, a citizen of the UnitedStates, residing at Newark, in the county of Essex and State of NewJersey, have invented certain new and useful Improvements inlVatchcase-Springs; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to lettersof reference marked thereon, which form a part of this specification.

This invention has reference to improvements in watchcase-springs, andhas for its primary object to secure greater durability of the spring,simplicity of construction, and also ease of adjustment.

A further and essential object of this invention is to provide awatchcase -spring, either a lift-spring or a re1ease-sprin g, which,when arranged in a watchcase-center, will firmly set therein, beingsecurely held in the backing tolwhich it is secured in such a mannerthat the spring cannot drop out or be accidentally pulled from itsoperative position, and must be sprung into a T-shaped slot or openingin the said backing, in which it is held in locked engagement.

The invention therefore consists in the novel arrangements andcombinations of parts, such as will be hereinafter fully described, andfinally embodied in the claim.

The invention is illustrated in the accompanying drawings, in whichsimilar letters of reference are employed to indicate correspondingparts in the several views.

In said drawings, Figures 1 and 2 are a top and bottom view,respectively, of the spring in position in its backing. Fig. 3 is aperspective view of the spring. Fig. 4 is a top View of the backing.Fig. 5 is a face view of the same when looking in the direction of arrowas in Fig. 4, and Fig. 6 is a bottom View of said backing.

111 said views co indicates the spring, and b the backing. The spring ais curved to conform with the curvature of the backing b, and the latteris curved to correspond with the inner curvature of the case-center.Said spring a is provided with the usual form of Serial No. 593,878. (Nomodel.)

spur or finger a, and at any suitable point, preferably near the middle,with a short ear or lip (R, which is bent over at an angle, as at 0L3,on the outer or convex side of the spring a, substantially asillustrated in Fig. 3.

As will be seen from Figs. 4:, 5, and 6, the backing b is provided onits inner or convex surface with two oppositely-arranged fingers orprojections 71, having the opening 1) between them and thelongitudinally-arranged slot or opening 19 behind them. Each projectionZ) is cut away, as at 12 (see Fig. 5,) whereby a seat is formed on thetop of each projection b for the outwardly-extending portion a of thelip or tongue (t when the bent-over part a is forced down into the slot6 as will be clearly evident.

To secure the spring a in its locked position against the concave sideof the backing b, the two free ends of the spring are placed between thethumb and first finger, the spring being slightly compressed by pressureeX- erted in this manner upon the said ends of the spring, and thebent-over part a of the lip or tongue at on said spring can be easilyinserted in place in the longitudinal slot 12 in the backing b. Theoutwardly-extending portion a of the lip or tongue a is then firmlypressed down upon the two fingers or projections Z), whereby said lip ortongue a of the spring a is hugged on all sides by the slotted parts ofsaid backing h, and the spring Ct is thereby securely locked in placeagainst the said backing b and cannot drop out of place or beaccidentally pulled from its position in the curved portion of the saidbacking b when once placed in the watchcase-center. By means of thisnovel arrangement and combination of parts I obtain many advantages, ofwhich the following are the most essential; first, perfect elasticity ofthe spring throughout its entire length; secondly, simplicity ofconstruction,and, thir(lly,a perfect and secure bearing against theinner and concave surface of the backing, and, owing to the arrangementof the T-shaped slot or opening in the said backing, forming a lockwhich prevents the spring from dropping out of place or from beingaccidentally pulled out of place. Having thus described my invention,what I claim is- A watchcasespring a, provided with a lip or tonguehn-vingzin outWzu-dly-extendi11g of, all arranged, substantially (LS mnlfor the part a" and adownwurdly-projeeting portion purposes set forth.

a, in combination, with a backing I), having in testimony that I claimthe invention set oppositely-arranged fingers or projections I), forthabove I have hereunto set my hand this 5 with an opening 1) betweenthem, a longitu- 26th day of May, 1890.

dinall y'a rru nged slot oropenil'igb into wlrie h CHARLES Nous JR saiddounuarclly -1)ro eot 1ng portion a" is adapted to be fitted, and saidlingers I) being Witnesses:

cut away, as at b forming seats for said out- FREDK. U. FRAENTZEL, 1ownrdlyextendi11g part (i-0E saicllip or tongue M. II. UAMFIELD, Jr.

